Single-mode monolithic fiber laser with 200  W output power at a wavelength of 1018  nm

Abstract

We report on an ytterbium-doped monolithic fiber laser at a wavelength of 1018 nm with an output power of 200 W in continuous wave operation. The optimal parameters for setting up such a high-power fiber laser with an ytterbium-doped fiber are investigated and discussed in detail. An in-house-developed pump light stripper and a single-mode fused fiber coupler were applied to use the fiber laser for core-pumping of ytterbium-doped high-power fiber amplifiers in a monolithic setup.

Towards an all-integrated MOPA configuration using Yb-doped ion-exchanged waveguides

“…The Fresnel reflections (OC~96%) from the waveguide facet were used to provide feedback to the laser cavity which allowed laser operation at 1017 nm. This wavelength could be of interest for core-pumping of amplifier systems [5]. The seed output was launched into the amplifier and the results of the output power as a function of launched pump power for different seed powers is shown in figure 2.…”

Advances in CO2 laser fabrication for high power fibre laser devices

“…There are many different CO 2 laser side-processing techniques that can be used to fabricate CLS devices [13,14]. The fibre can be swept through a fixed CO 2 laser beam, the fibre can be rotated while being transversely irradiated by the beam, or the beam can be scanned across it while being translated vertically.…”

“…One important application of this technique is that it can be used to fabricate all-glass CLS [13,14] that are able to provide high loss for radiation contained within the cladding region and strip high powers without damaging the device. In this section, we describe some of the key physical and optical properties of these devices and a specific characterization technique applicable to precision CLS fabrication in specialty optical fibres such as triple clad fibres and fibres with highly doped cores.…”

Single-mode spectral beam combining of high power Tm-doped fiber lasers with WDM cascades

“…However, the beam quality of the laser sources degraded completely due to the use of combiners employing multimode fibers. Spectral beam combining utilizing single mode WDMs is a promising approach 13 , as the high beam quality of the laser building blocks is maintained 14,15 . We report on spectral beam combining of four thulium-doped fiber oscillators by using a highly efficient in-housemade WDM cascade at a power level of 38 W. The combining section consists of three WDMs, while two of them were used for combining oscillators with a small wavelength separation of 30 nm, a third one was used to combine both wavelength sub-groups.…”